Use Identities to Find the Indicated Value for Each Angle $\cos 2 \theta = \frac { 4 } { 5 }$

Use identities to find the indicated value for each angle measure.
- $\cos 2 \theta = \frac { 4 } { 5 }$ and $\theta$ terminates in quadrant I Find $\sin \theta$ .

A) $\sin \theta = - \frac { \sqrt { 10 } } { 10 }$
B) $\sin \theta = 0$
C) $\sin \theta = \frac { \sqrt { 10 } } { 10 }$
D) $\sin \theta = \sqrt { 10 }$

Correct Answer:

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